"Primary development" on Aliens: Colonial Marines was outsourced to Section 8 developer TimeGate Studios.
The 'developer', who goes on to state that he or she has since moved on to new Austin-based studio Armature, claims that core studio Gearbox actually focused it efforts on the game's multiplayer mode.
The post reads: "Hate to say it, but I wouldn't get your hopes up too high for Colonial Marines. I used to work at Gearbox, and the development of that game has been a total train wreck, going on what, six years now?
"Gearbox isn't even making the game, except for the multiplayer. Primary development was outsourced to TimeGate Studios, which has a less than stellar past.
"I hope it proves me wrong, as I still have alot of friends still working at Gearbox, but I am expecting it to be average at best."
CVG has contacted Sega for comment.
TimeGate's involvement in the Colonial Marines project has been known, and Texas studio Nerve and Demiurge Studios also contributed to development - the latter heading up the Wii U version of the game.
However, Gearbox president Randy Pitchford is reported to have claimed last year that his in-house team contributed "roughly 80 percent of the work" on Colonial Marines.
TimeGate's previous work includes RTS game Axis & Allies, plus F.E.A.R. expansion Extraction Point.
Aliens: Colonial Marines reviews went live this morning and although they're largely negative, most reserve praise for the game's online offering.